2115. MANTELL, R. M. (Allied Chemical & Dye Corp.). Preparation of Internally Oxidized Catalysts. United States Patent 2,517,223, Aug. 1, 1950; appl. filed Aug. 23, 1948, Serial No. 45,790; 8 claims (Cl. 75-22). Chem. Abs., vol. 44, 1950, p. 9592.

Metal for the catalyst is mixed with a solid substance, which will decompose at a temperature < the sintering point of the catalyst metal, liberating a fluid oxidizing substance. The mixture is compressed into the desired form and heated in air or O₂-containing gas to decompose the solid substance and oxidize the metal, 300°-400° C. Firm, highly porous metal oxide bodies are produced. Cu, Fe, Ni, Co, Cr, Mo, Zn, Ag, or mixtures or alloys may be used. Nitrates, permanganates, and dichromates may be used as oxidant in amount 1-25% of the weight of the metal. 1 literature ref. and 5 United States patents cited.

MARECEK, E. See abs. 3258, 3259.

MARINESCO, N. See abs. 2183.